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Human influenza 人類流感

Influenza is a respiratory infection caused by the influenza virus, different forms of which are normally circulating in not just human beings but pigs and birds. All influenza viruses are divided into A, B and C, and further distinguished by their H and N antigens. There are currently 16 H (standing for haemaglutinin) and 9 N (standing for neuraminidase) antigens. The novel swine flu discovered in 2009 has probably originated from pigs and is classified as Influenza A (H1N1). The genetic structure of the novel swine flu contains segments from pig, bird and human, reflecting the occurrence of reassortment. Studies suggested a case fatality rate of 0.4% for the novel infection, and a higher tendency for causing disease in young people compared to seasonal flu.

流感是指『流感病毒』引起的呼吸道傳染病,所影響的不單是人,也包括豬和禽鳥。『流感病毒』分甲、乙、丙三個主要類型,又以H(血凝素)和N(神經氨酸酶)基因作更仔細的分類,而現時已知的共有十六種H和九種N基因。二零零九年新發現的人類豬型流感病毒屬於甲型H1N1類型,相信源頭來自豬隻。新病毒包含了人、豬和禽鳥流感病毒基因,反映了基因重組現象。研究顯示,新流感的死亡率約百份之零點四。而相對於季節性流感,新流感對年青人的致病機會相對較高。

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